Ecosystem_Quiz_4

Our atmosphere contains nearly 79% of _________________but it can not be used directly by the majority of living organisms.

• Oxygen

• Nitrogen

• Carbon dioxide

• ozone

The process of conversion of gaseous nitrogen into Ammonia, a form in which it can be used by plants is ________________

• Nitrogen assimilation

• Nitrogen fixation

• nitrogen degradation

Rhizobium in the root nodules of leguminous plants is____________

• symbiotic virus

• symbiotic bacteria

• symbiotic nodes

________________ can combine atmospheric or dissolved nitrogen with hydrogen to form ammonia.

• Nitrides

• Cyanobacteria

• Algae

process by which ammonia is converted into nitrates or nitrites is_________

• nutrification

• nitrogen fixation

• nitrification

process nitrogen fixed by plants is converted into organic molecules such as proteins, DNA, RNA is _______________

• association

• Assimilation

• fixation

These waste products as well as dead remains of organisms are converted back into inorganic ammonia by the bacteria This process is called______________

• ammonification.

• associationa

• ssimilation

Conversion of nitrates back into gaseous nitrogen is called ________________

• deforstation

• dissociation

• denitrification.

• nitrification

______________and precipitation are two main processes involved in water cycle

• Evaporation

• Cooling

• Filteration

_________________ cycle It is a type of biogeochemical cycle where the main reservoir is lithosphere.

• gaseous

• Sedimentary

• solid